linux-kernel - Re: [PATCH] scsi/sg: don't grab scsi host module reference

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Date:   Wed, 21 Jun 2023 08:47:10 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Yu Kuai <yukuai1@...weicloud.com>, hch@....de,
        chaitanyak@...dia.com, shinichiro.kawasaki@....com,
        dgilbert@...erlog.com, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, yukuai3@...wei.com, axboe@...nel.dk
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        yi.zhang@...wei.com, yangerkun@...wei.com
Subject: Re: [PATCH] scsi/sg: don't grab scsi host module reference

On 6/21/23 09:01, Yu Kuai wrote:
> From: Yu Kuai <yukuai3@...wei.com>
> 
> In order to prevent request_queue to be freed before cleaning up
> blktrace debugfs entries, commit db59133e9279 ("scsi: sg: fix blktrace
> debugfs entries leakage") use scsi_device_get(), however,
> scsi_device_get() will also grab scsi module reference and scsi module
> can't be removed.
> 
> It's reported that blktests can't unload scsi_debug after block/001:
> 
> blktests (master) # ./check block
> block/001 (stress device hotplugging) [failed]
>       +++ /root/blktests/results/nodev/block/001.out.bad 2023-06-19
>        Running block/001
>        Stressing sd
>       +modprobe: FATAL: Module scsi_debug is in use.
> 
> Fix this problem by grabbing request_queue reference directly, so that
> scsi host module can still be unloaded while request_queue will be
> pinged by sg device.

pinged -> pinned

Otherwise this patch looks good to me.

Bart.